<template>
  <header class="header">
    <h1>小黑记事本</h1>
    <input placeholder="请输入任务" class="new-todo" v-model="txt" />
    <button class="add" @click="add">添加任务</button>
  </header>
</template>

<script>
export default {
  data() {
    return {
      txt: "",
    };
  },
  methods: {
    add() {
      if (this.txt === "") {
        return;
      }
      this.$emit("addList", { id: +new Date(), todo: this.txt });
      this.txt = "";
    },
  },
};
</script>

<style>
</style>